.maze {}
.maze:after {width: 0;height: 0;content: "";clear: both;}
.w {background-color: blue;width: 10px;height: 10px;padding: 0;margin: 0;float: left;}
.p {background-color: white;width: 10px;height: 10px;padding: 0;margin: 0;float: left;} 
.s, .e {background-color: yellow;width: 10px;height: 10px;padding: 0;margin: 0;float: left;}
.mid_1 button {display: block;padding: 10px;border: none;border-radius: 3px;cursor: pointer;}